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herror.c revision 1.9 
      1 /*	$NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987, 1993
      5  *    The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  * 	This product includes software developed by the University of
     18  * 	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
     38  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
     39  *
     40  * Permission to use, copy, modify, and distribute this software for any
     41  * purpose with or without fee is hereby granted, provided that the above
     42  * copyright notice and this permission notice appear in all copies.
     43  *
     44  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
     45  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     46  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
     47  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     48  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     49  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     50  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     51  */
     52 
     53 #include <sys/cdefs.h>
     54 #if defined(LIBC_SCCS) && !defined(lint)
     55 #ifdef notdef
     56 static const char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
     57 static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
     58 #else
     59 __RCSID("$NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 christos Exp $");
     60 #endif
     61 #endif /* LIBC_SCCS and not lint */
     62 
     63 #include "port_before.h"
     64 
     65 #include "namespace.h"
     66 #include <sys/types.h>
     67 #include <sys/param.h>
     68 #include <sys/uio.h>
     69 
     70 #include <netinet/in.h>
     71 #include <arpa/nameser.h>
     72 
     73 #include <netdb.h>
     74 #include <resolv.h>
     75 #include <string.h>
     76 #include <unistd.h>
     77 
     78 #include "port_after.h"
     79 
     80 const char *h_errlist[] = {
     81 	"Resolver Error 0 (no error)",
     82 	"Unknown host",				/*%< 1 HOST_NOT_FOUND */
     83 	"Host name lookup failure",		/*%< 2 TRY_AGAIN */
     84 	"Unknown server error",			/*%< 3 NO_RECOVERY */
     85 	"No address associated with name",	/*%< 4 NO_ADDRESS */
     86 };
     87 int	h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
     88 
     89 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
     90 #undef	h_errno
     91 int	h_errno;
     92 #endif
     93 
     94 #ifdef __weak_alias
     95 __weak_alias(herror,_herror)
     96 #endif
     97 
     98 /*%
     99  * herror --
    100  *	print the error indicated by the h_errno value.
    101  */
    102 void
    103 herror(const char *s) {
    104 	struct iovec iov[4], *v = iov;
    105 	char *t;
    106 
    107 	if (s != NULL && *s != '\0') {
    108 		DE_CONST(s, t);
    109 		v->iov_base = t;
    110 		v->iov_len = strlen(t);
    111 		v++;
    112 		DE_CONST(": ", t);
    113 		v->iov_base = t;
    114 		v->iov_len = 2;
    115 		v++;
    116 	}
    117 	DE_CONST(hstrerror(*__h_errno()), t);
    118 	v->iov_base = t;
    119 	v->iov_len = strlen(v->iov_base);
    120 	v++;
    121 	DE_CONST("\n", t);
    122 	v->iov_base = t;
    123 	v->iov_len = 1;
    124 	(void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
    125 }
    126 
    127 /*%
    128  * hstrerror --
    129  *	return the string associated with a given "host" errno value.
    130  */
    131 const char *
    132 hstrerror(int err) {
    133 	if (err < 0)
    134 		return ("Resolver internal error");
    135 	else if (err < h_nerr)
    136 		return (h_errlist[err]);
    137 	return ("Unknown resolver error");
    138 }
    139 
    140 /*! \file */
    141